diff a/src/hotspot/share/gc/g1/g1VMOperations.hpp b/src/hotspot/share/gc/g1/g1VMOperations.hpp
--- a/src/hotspot/share/gc/g1/g1VMOperations.hpp
+++ b/src/hotspot/share/gc/g1/g1VMOperations.hpp
@@ -78,15 +78,16 @@
 };
 
 // Concurrent G1 stop-the-world operations such as remark and cleanup.
 class VM_G1PauseConcurrent : public VM_Operation {
   uint         _gc_id;
+  bool         _is_shutting_down;
   const char*  _message;
 
 protected:
   VM_G1PauseConcurrent(const char* message) :
-    _gc_id(GCId::current()), _message(message) { }
+    _gc_id(GCId::current()), _is_shutting_down(false), _message(message) { }
   virtual void work() = 0;
 
   // Does this concurrent pause affect the memory pools? If so, update the collectionUsage()
   // MemoryMXBean for the old gen memory pool (which is the only pool registered for concurrent
   // pauses).
@@ -114,6 +115,17 @@
   VM_G1PauseCleanup() : VM_G1PauseConcurrent("Pause Cleanup") { }
   VMOp_Type type() const override { return VMOp_G1PauseCleanup; }
   void work() override;
 };
 
+class VM_G1StopMarking : public VM_Operation {
+public:
+  VM_G1StopMarking() : VM_Operation() { }
+  VMOp_Type type() const override { return VMOp_G1StopMarking; }
+
+  bool doit_prologue() override;
+  void doit() override;
+
+  bool is_gc_operation() const override { return true; }
+};
+
 #endif // SHARE_GC_G1_G1VMOPERATIONS_HPP